OAR 340-042-0090: Total Maximum Daily Loads and Water Quality Management Plans

The following TMDLs are adopted by EQC by reference in this rule on the dates indicated. The TMDL documents and supporting information for TMDLs adopted as rule or issued by order are available on DEQ’s website. (1) Upper Yaquina River Watershed, USGS watershed of the Northern Oregon Coastal Basin (HUC 1710020401): (a) TMDL: bacteria and dissolved oxygen, September 14, 2023 (b) WQMP: bacteria and dissolved oxygen, September 14, 2023 (2) Powder River Basin, USGS Subbasin of the Middle Snake-Powder Basin (HUC 170502), including the Powder River Subbasin (HUC 17050203), Burnt River Subbasin (HUC 17050202) and Brownlee Subbasin (HUC 17050201): (a) TMDL: bacteria for E. coli , May 23, 2024 (b) WQMP: bacteria for E. coli , May 23, 2024 (3) Willamette Subbasins – Ten subbasins within the Willamette Basin (HUC 170900), including the Middle Fork Willamette Subbasin (HUC 17090001), Coast Fork Willamette Subbasin (HUC 17090002), Upper Willamette Subbasin (HUC 17090003), McKenzie Subbasin (HUC 17090004), North Santiam Subbasin (HUC 17090005), South Santiam Subbasin (HUC 17090006), Middle Willamette Subbasin (HUC 17090007), Molalla-Pudding Subbasin (HUC 17090009), Clackamas Subbasin (HUC 17090011), and Lower Willamette Subbasin (HUC 17090012). (a) TMDL: temperature, May 8, 2025 (b) WQMP: temperature, May 8, 2025 (4) Lower Columbia-Sandy Subbasin (HUC 17080001), within the USGS Lower Columbia Basin (HUC 170800) (a) TMDL: temperature, August 6, 2024 (b) WQMP: temperature, August 6, 2024